2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
12 // Endian related functions.
14 #ifndef AOM_AOM_UTIL_ENDIAN_INL_H_
15 #define AOM_AOM_UTIL_ENDIAN_INL_H_
19 #include "config/aom_config.h"
21 #include "aom/aom_integer.h"
24 #define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__)
25 #define LOCAL_GCC_PREREQ(maj, min) (LOCAL_GCC_VERSION >= (((maj) << 8) | (min)))
27 #define LOCAL_GCC_VERSION 0
28 #define LOCAL_GCC_PREREQ(maj, min) 0
31 // handle clang compatibility
33 #define __has_builtin(x) 0
36 // some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
37 #if !defined(WORDS_BIGENDIAN) && \
38 (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
39 (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
40 #define WORDS_BIGENDIAN
43 #if defined(WORDS_BIGENDIAN)
44 #define HToLE32 BSwap32
45 #define HToLE16 BSwap16
46 #define HToBE64(x) (x)
47 #define HToBE32(x) (x)
49 #define HToLE32(x) (x)
50 #define HToLE16(x) (x)
51 #define HToBE64(X) BSwap64(X)
52 #define HToBE32(X) BSwap32(X)
55 #if LOCAL_GCC_PREREQ(4, 8) || __has_builtin(__builtin_bswap16)
56 #define HAVE_BUILTIN_BSWAP16
59 #if LOCAL_GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap32)
60 #define HAVE_BUILTIN_BSWAP32
63 #if LOCAL_GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap64)
64 #define HAVE_BUILTIN_BSWAP64
67 #if HAVE_MIPS32 && defined(__mips__) && !defined(__mips64) && \
68 defined(__mips_isa_rev) && (__mips_isa_rev >= 2) && (__mips_isa_rev < 6)
69 #define AOM_USE_MIPS32_R2
72 static INLINE
uint16_t BSwap16(uint16_t x
) {
73 #if defined(HAVE_BUILTIN_BSWAP16)
74 return __builtin_bswap16(x
);
75 #elif defined(_MSC_VER)
76 return _byteswap_ushort(x
);
78 // gcc will recognize a 'rorw $8, ...' here:
79 return (x
>> 8) | ((x
& 0xff) << 8);
80 #endif // HAVE_BUILTIN_BSWAP16
83 static INLINE
uint32_t BSwap32(uint32_t x
) {
84 #if defined(AOM_USE_MIPS32_R2)
87 "wsbh %[ret], %[x] \n\t"
88 "rotr %[ret], %[ret], 16 \n\t"
92 #elif defined(HAVE_BUILTIN_BSWAP32)
93 return __builtin_bswap32(x
);
94 #elif defined(__i386__) || defined(__x86_64__)
95 uint32_t swapped_bytes
;
96 __asm__
volatile("bswap %0" : "=r"(swapped_bytes
) : "0"(x
));
98 #elif defined(_MSC_VER)
99 return (uint32_t)_byteswap_ulong(x
);
101 return (x
>> 24) | ((x
>> 8) & 0xff00) | ((x
<< 8) & 0xff0000) | (x
<< 24);
102 #endif // HAVE_BUILTIN_BSWAP32
105 static INLINE
uint64_t BSwap64(uint64_t x
) {
106 #if defined(HAVE_BUILTIN_BSWAP64)
107 return __builtin_bswap64(x
);
108 #elif defined(__x86_64__)
109 uint64_t swapped_bytes
;
110 __asm__
volatile("bswapq %0" : "=r"(swapped_bytes
) : "0"(x
));
111 return swapped_bytes
;
112 #elif defined(_MSC_VER)
113 return (uint64_t)_byteswap_uint64(x
);
114 #else // generic code for swapping 64-bit values (suggested by bdb@)
115 x
= ((x
& 0xffffffff00000000ull
) >> 32) | ((x
& 0x00000000ffffffffull
) << 32);
116 x
= ((x
& 0xffff0000ffff0000ull
) >> 16) | ((x
& 0x0000ffff0000ffffull
) << 16);
117 x
= ((x
& 0xff00ff00ff00ff00ull
) >> 8) | ((x
& 0x00ff00ff00ff00ffull
) << 8);
119 #endif // HAVE_BUILTIN_BSWAP64
122 #endif // AOM_AOM_UTIL_ENDIAN_INL_H_